Spectral characteristics of a ternary-mixture of dyes in a dye laser pumped by copper vapor laser

Abstract

The spectral characteristics of a ternary-mixture, composed of Rhodamine 640, Rhodamine 6G and DCM in ethanol and excited by copper vapor laser, are reported. The concentration of each dye in the ternary-mixture was optimized to provide peak emission at 633nm and absorb both wavelengths of copper vapor laser, i.e. 510.6 and 578.2nm. A fluorescence range of 612–679nm with a relatively broad peak at 631–634nm was obtained when concentrations of Rhodamine 640, Rhodamine 6G and DCM in the ternary-mixture were 0.90mM, 0.30mM and 0.90mM respectively. This ternary-mixture of dyes in ethanol, when used as a gain medium in a narrowband, tunable dye laser oscillator, transversely pumped by both wavelengths of a copper vapor laser, provided a spectral tuning range of 620–665nm with an almost flat peak at 630–634nm.